From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 49F2FC2BA17 for ; Mon, 6 Apr 2020 18:17:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2491D20672 for ; Mon, 6 Apr 2020 18:17:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=c-s.fr header.i=@c-s.fr header.b="aIXMTl0c" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727800AbgDFSRc (ORCPT ); Mon, 6 Apr 2020 14:17:32 -0400 Received: from pegase1.c-s.fr ([93.17.236.30]:38379 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726699AbgDFSQl (ORCPT ); Mon, 6 Apr 2020 14:16:41 -0400 Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 48wzJS5VDmz9tyd4; Mon, 6 Apr 2020 20:16:40 +0200 (CEST) Authentication-Results: localhost; dkim=pass reason="1024-bit key; insecure key" header.d=c-s.fr header.i=@c-s.fr header.b=aIXMTl0c; dkim-adsp=pass; dkim-atps=neutral X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id TGiJ8bsEBvz7; Mon, 6 Apr 2020 20:16:40 +0200 (CEST) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 48wzJS4R7Jz9tycr; Mon, 6 Apr 2020 20:16:40 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=c-s.fr; s=mail; t=1586197000; bh=/9XgCX7ZNJJPrUF+WQ+S9CCuMlj+u/mt4LD/Anh8LO4=; h=In-Reply-To:References:From:Subject:To:Cc:Date:From; b=aIXMTl0ci/qJ/Zg5T2BGlqvBO1C1o9yWOJW4tbot1k/1Vxo24G2LGIOlcCU1B366H jdhFCo7arjVZtaC8L4xtkAVwtcv46BaH55AHk+6olCmzyhT2HZ3vH+4AHL0l6L7U24 TFoQh+jeUwZvMvk38AEVDc7Vw0SbtWwFXvtTwdIQ= Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 8ECBB8B784; Mon, 6 Apr 2020 20:16:40 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id Tb15_YGivxb0; Mon, 6 Apr 2020 20:16:40 +0200 (CEST) Received: from pc16570vm.idsi0.si.c-s.fr (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 59D4F8B775; Mon, 6 Apr 2020 20:16:40 +0200 (CEST) Received: by pc16570vm.idsi0.si.c-s.fr (Postfix, from userid 0) id 30558656E9; Mon, 6 Apr 2020 18:16:40 +0000 (UTC) Message-Id: In-Reply-To: <5aeaa33383e833f6eca30893fbd188b88e019eaa.1586196948.git.christophe.leroy@c-s.fr> References: <5aeaa33383e833f6eca30893fbd188b88e019eaa.1586196948.git.christophe.leroy@c-s.fr> From: Christophe Leroy Subject: [RFC PATCH v3 04/15] powerpc/8xx: Create C version of kuap_restore() and kuap_check() To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , npiggin@gmail.com, msuchanek@suse.de Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Date: Mon, 6 Apr 2020 18:16:40 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In preparation of porting PPC32 to C syscall entry/exit, create C version of kuap_restore() and kuap_check() on 8xx Signed-off-by: Christophe Leroy --- arch/powerpc/include/asm/nohash/32/kup-8xx.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/powerpc/include/asm/nohash/32/kup-8xx.h b/arch/powerpc/include/asm/nohash/32/kup-8xx.h index 85ed2390fb99..1918d2e55da3 100644 --- a/arch/powerpc/include/asm/nohash/32/kup-8xx.h +++ b/arch/powerpc/include/asm/nohash/32/kup-8xx.h @@ -34,6 +34,19 @@ #include +static inline void kuap_restore(struct pt_regs *regs) +{ + mtspr(SPRN_MD_AP, regs->kuap); +} + +static inline void kuap_check(void) +{ + if (!IS_ENABLED(CONFIG_PPC_KUAP_DEBUG)) + return; + + WARN_ON_ONCE((mfspr(SPRN_MD_AP) & 0xffff0000) != (MD_APG_KUAP & 0xffff0000)); +} + static inline void allow_user_access(void __user *to, const void __user *from, unsigned long size, unsigned long dir) { -- 2.25.0